Okay, sorry I have to add my bit:
-first, if your child's class teacher is doing less than the other teachers in the school absolutely criticise them and make sure you do so to the Head but also bear in mind there may be things going on at home, maybe someone has Covid and that is why they are not doing what the other teachers are? Of course it is also possible they are just lazy. I work in a school where both cases are applicable - one teacher has just gone off the radar and their parents are kicking up a fuss (the Head is now dealing with it), in another class a parent kicked up merry hell because a teacher hadn't replied to an e-mail within the morning, kicked up a fuss and had to be told by the head that they had just got off the phone with the teacher who's father had died from Covid - the parent at least had the manners to apologise profusely.
-if your class teacher is doing the same as the rest of the teachers in school then don't criticise "teachers" criticise "schools", "school managers", "the government", "the system" or a million other nouns rather than "teachers" who are doing what they have been told by the Head/LEA/government (note the government has given 0 guidance on what schools should be doing during this)
Also please remember not all teachers are 'sitting at home getting paid to do nothing'.
I have been going to school 3 days a week since lockdown began, I have to get in earlier than before because the morning drop off staff are not in and I am taking care of children from 7.30 until 3.30pm, there is no break cover other than what the three of us in sort between us. I teach 3 year groups in one, whilst answering emails and our communication app message from parents. After 3.30 I stay to record videos for online learning, scan resources to post online etc.
On the two days I am "working from home" I phone all the children in my class, speaking to both the child and parent, each call takes about 20mins and I have 21 children. The majority of each call is taken up talking to parents basically as a counsellor as they tell me how they are struggling to cope, some even end the call saying they are sure I'm enjoying the good weather outside as if I'm not about to call another 19 parents. I mark work sent back digitally, post daily challenges, outdoor activities and PHSE related tasks (yoga vids, mindfulness colouring etc) to stop everyone going mad. I have a weekly staff meeting via zoom, plan next week's work, mark more work sent it, update SEN provision plans. I'll be the first to admit I probably take an extra half day to myself in "school time" but that makes up for spending Sunday afternoon putting together the next week's resources and posting them onto google classroom for the week (parent's didn't want daily updates so they now get the weekly one they wanted plus a daily update on our comms app). I am also writing reports, grade cards, ordering stock for next year and going out to buy cleaning products and hand wash to use if/when all pupils return out of my own money.
Also don't forget the 3 days I am in school I am increasing my risk of getting ill because despite what the government thinks I won't stand there arms folded when a child falls over and cries, or cries because their parents are key workers and are working so much and they miss them or cries because a relative has died from covid. I have to break the 2m rule to tie shoe laces and change kids after toilet accidents.
I am just a regular class teacher in an independent school, I am not a manager or head, I am probably paid less than most other teachers as most have been teaching more than me.
If your school is doing all this and you think it is not enough then criticise the school and demand they do more but I hope you are aware that everyone has their limitations. I can fit all that because I have no kids, but I now rarely see my partner (a doctor working daft shifts because of all of this) and don't see other family because between us both we feel the risk is to great of passing something on to parents, grandparents and siblings. I haven't held by new baby nephew since he was born a month ago.
If you think I am sitting at home getting paid to do nothing than please do tell me, and tell me where you think I could do more! If you think I'm doing my bit than please stop saying "all teachers" and either be specific about certain lazy teachers (there are plenty I know!) or criticise the school or LEA for not expecting more from teachers but don't criticise the teachers for doing what is asked/expected of them. Also bear in mind if you are struggling its likely teachers are too (they have families and kids to home school as well).
Also think about this, what does it say about society when people will happily go out and clap for NHS staff, care workers, postal workers, refuse collectors, supermarket workers, gas and electricity workers but not the people looking after their own children. (I 10000% support clapping for everyone who has to still work outside of their own home during this).