the best way to "encounter them" is to ignore them.
What they want most is attention which will get them publicity and, sooner or later, an altercation that the media can then use to overshadow the whole movement,
Don't let's be dumb enough to fall into their trap.
Smile, give a chuckle and walk away. Don't say one word to them.
Without the attention they hoping for, they WILL go away.
Give them attention, they'll multiply...and that's all that will be shown on TV.
We defeat ourselves by acknowledging them.
Use their own tactics against them. What did alinsky say? "Isolate your target, ridicule them" or somethinglike that.