Luckily I do not require a flame thrower; everything is illegal in the UK, so I guess I would have to order it one part at a time and assemble it myself. I'm not sure I'd have the patience, especially if the instructions were in Mandarin.
Sometimes when I'm doing door work I have to intervene in situations when a woman is being harassed or molested,( I actually don't have to, but I do it anyway). Usually I just shout a lot and embarrass and humiliate the perpetrator, and let them know that I will happily spend my time making a witness statement to the police. I tend to be very loud about it so that everyone looks at him and recognises him next time they see him. Often what seems to happen is that men in their 30's 40's ,50's can't keep their hands to themselves and can't handle being ignored or rejected by very young women, - often young enough to be their daughter. Young men seem to be much better behaved for some reason, although there is the odd exception.
Sadly, I think that if I had a daughter I would advise her to be clever and charming, and pretend to be flattered but make it clear that she was not single, and was very much in love with her boyfriend. Even though "fuck off" is really the right answer, it's not safe to say that, and can provoke some very bizarre and unpleasant responses.