I don't really like it when people touch my things without permission.

You don't go into people's rooms and assume that you can use the stuff there without asking for permission first. It's just rude, really. You could be friends with somebody for 50 years and unless the person has given you explicit permission to use their stuff, "Feel free to use my hairbrush for as long as you live", you simply don't saunter into a room and use their stuff without permission first.

I'm pretty germophobic too, and I personally find it fucking gross when people touch their feet, or happily put their hands on grimy tables at the kopitiam, or pick their noses in public and then wipe it on the mrt train wall.

So I really don't like it if someone who's been out the entire day or been god-knows-where, sitting at kopitiams or on roadside curbs, comes over and sits on my bed. Or anyone else's bed, for that matter. That in my head is just horrendously gross.

It's not too much to ask for, is it?