I think there is a fine line between it being a fair thing to do, and a dick thing to do.
Its fair that people use the skills they have trained for, we cant really tell em not to use those skills, it would be the same as telling people to not use any other skills for TTT that thry learned.
But is it a Dick-ish way to play? Most certainly, make yourself hard to hit, can easily delay the round by hopping around while the Ts cant catch up etc. Its not fun at all to play against, but it is fair play