Had some guys try to do that to me bass fishing last summer, but if they get that close to me they'll might need to go to the hospital to get some treble hooks removed from their body.
The idiots blasted thru the creek mouth within 40 yds of us and stopped about 50 yds ahead. We proceeded to catch 4 right behind them, and they had none. The fished the rest of that bank, then crossed to the other bank I had already planned on fishing. They started on one end, and I started on the other. About halfway down, we met. I was not going to give these rude guys an inch of room. They got closer, closer, and closer, so I grabbed my rattle trap on my favorite baitcaster and began casting it less than 5' from the guy in the front of his boat. It was quite funny how they instantly became "so friendly." Asked how we were doin, informed us they just needed a couple more gud 'uns for the tourney they were in, and scoped out our rigs as they passed. Best part was they witnessed us throwing back the "couple more gud 'uns" they needed so bad!!
IF I can hit you or your boat with my lure, you are WAY to close. And believe me, I will let you know.