I am sorry, I understand this as I grew up socially awkward and had a lot of this in my life, and it has sometimes happened as an adult, too. Anyone that just makes fun of someone to make them feel bad has their own issues, and it is not right. When it happens a lot it is easy to think it is us. Not to say there is nothing for us to work on, but there is no excuse for just bringing someone down on purpose. It is not constructive.

What I am trying to do when that kind of stuff happens is 1) not make myself stay there and tolerate it, leave if I want to 2) if comfortable tell the person how it makes me feel and that I don't feel okay with that 3) offer myself self compassion, telling myself kinder things and that it is really difficult to be made fun of. I talk to my inner child and also sometimes do self compassion exercises/meditation. Honestly I am probably my own biggest bully and need the self compassion even when no one has said mean things to me.