I love my BFF but I’m really struggling over this.

[CloudWatch]

Been best friends for over 20 years, we are very close. She has 2 DC as do I, and I’ve had only DH to help whereas she has a lot of family. It’s never bothered me though because that’s all I’ve known, and consequently she’s spent a lot more time with my children and I, than we’ve spent with her DC. My youngest isn’t at school yet whereas hers both are so we often spend a day together each week just doing the food shops or park or lunch. It’s great we have a lovely time and I really truly appreciate the help.

But, as our children age I’m struggling with how she speaks about her DC and also to my DC. With her children she’s always been quite quick to criticise them, or tell them off before they’ve done something.

examples from yesterday
“you can’t go on that because I don’t trust you’ll not do x, y, z”- at the park
”you watch utter rubbish on YouTube” -took the tablet away without warning
”have you looked in the mirror you look stupid” - her DC did their own make up

She has said many times in front of the kids how mine are ‘angels’, and why can’t they be like my DC. (They’re not always angels but I am perhaps more strict and try to always be calm and respectful)

Yesterday she went to cuddle my toddler, who turned away, and she said “oh suit you, I didn’t want a hug anyway! Off you go!” I didn’t know what to say and stupidly said nothing.

It’s making me feel very awkward, and I don’t know what to say/do.

I think your dc will be affected by your good parenting that you do with them 24/7 not the less than ideal stuff they see with your friend once a week.
If it's stopping you enjoying your time with the friend then perhaps you need to step back a bit and not see her with kids so frequently, they'll be in preschool soon enough.
I think saying something is tricky because you're unlikely to change her entire personality style but you might piss her off so much it ends the friendship which you say you value.
My only suggestion is, if she's moaning about her kids being awful, say do you want to borrow my copy of 'how to talk so kids will listen' it's really helped with getting the kids to listen to me. That might sound more helpful than critical.

You'll probably never meet another parent, who parents/talks to their kids exactly like you do. When your DC starts school they will come into contact with lots of different adults, teachers, school staff, parents of their friends, none of them will be like you.
Your friend hasn't done or said anything offensive to your child. Let it go and stop letting it bother you.