I agree with many of the posts here. Cursing is subjective and technical fouls are even more so. It is impractical and pointless to try and say x,y&z always constitute tech fouls.
An incident occurred to me several years ago, I was refereeing a former Yugoslavian league player and he objected to one of my calls. He started talking to me quite loudly in Yugoslavian and after a while I t'd him. His tema-mate (and captain) asked how I could T him, and wanted to know if I spoke Yugoslavian. I don't, but could definitely tell by his body language and tone of voice that he wasn't complementing me on my pants
Use your judgement, sometime the F-word is a tech, sometimes it isn't.