What are your tips on socialising with people who seem.....incredibly....confident

They usually aren't, can't really give anything beyond the cliche of "be yourself".
being someone else comes from lack of confidence in who you are.

ask them a question

Just be yourself

Act like yourself and stick to your values always

Start by kneecapping them, that will detract from their confidence a bit ...

We're not the right people to answer that question Lmao

Meh ... I let 'em do their thing; usually it's to attract attention.

Sounds like you're going to need to have sex with them.

dont some of them are real douches

Smile, nod, then quietly slip away.

Be yourself. Dont be fake.

Don't? Lol.

Act confident

A big pie in the face.