tell them to f.ck off. if they goto push u, forcefully push their arm away. if one punches you, punch back. being an aspie you probably have never been in a real fist fight before. not to be pro-fights but its really no big deal to get in a little fight. i doubt something like that would turn into a big fight unless u did something huge and unprovoked. just so your not scared; getting punched in the face does not hurt as bad as it looks. and if you are fighting back, it gets your blood pumping and your mussels naturally release some chemical that acts like a pain killer.
if you stand up for yourself once, people tend to stop f.cking with you.