It's not just parents.
I'm in FE.
I taught a group ITC 1 hour a week 9am, lots of students coming in late.
One student asked why I marked him absent the previous week, I said because he wasn't there.
He said he was. I said maybe I'd made a mistake (I didn't remember him being in class) so could he show me some of last weeks work. Well no, he hadn't done any work, but he claimed he had been in class.
I said he had no proof, I didn't remember him so no mark.
He spent the lesson complaining and the next 20 mins following me round to my next class and then reappeared at break.
I'm 5ft0 and he was 6ft, I was getting nervous.
I discussed it with my line manager before I went that day.
The next day there was an email to my line manager saying I was punishing students by not marking them present if they didn't work, that this was terrible behavior etc. etc. The student needed their EMA and I was being unfair.
The line manager forwarded the e-mail for me to respond.
I started by thanking the tutor for being so professional as to get the entire story before criticising a fellow professional.