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If someone seems to strangely walk up to you holding a microphone up to you saying "i'm just asking questions." they are likely Boditle (a well known alt right troll who will posts their interactions on Youtube with your face without asking for your permission.) or they may just be an right wing troll. So without adding a celebrity name to it, these individuals are usually signified as alt right trolls or similarly.
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If someone doesn't have a microphone and they approach you, to talk, make good judgement. Do they make you feel comfortable with their presence, are they talking like they are seriously here for the movement, protest, or LGBTQ+ parade. Are they questioning your sign or shirts, or outfit (if you're holding a sign or etc.)
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You should avoid putting hands on the individual (even if they aren't seriously injured they can still claim assault to the law cops against you.) and report them to the event organizers, and if things escalate, with the alt right trolls behavior, may have to get the law involved. In short don't feed trolls.
Yes, there are plenty of alt right streamers in the u.s as well. Laws will vary from country to country and if there is a law in the eu or similar country about how if someone is using hate speech but there is a possible acception to using a pushing away type of force for self defense that I may be missing someone could fill me in.
The classic blasting of copyrighted music will get them. In the us, the protest will sometimes just shout the protest slogans, trying to talk over the alt right trolls, so they just can't communicate with anyone, nor get it audible o carecordingmera what someone might say,
I doubt it, and it's generally a bad idea because they always try to paint themselves as the victim.
Half the time they don't directly answer your questions ad just talk around you and like they are telling you as an authority figure, how they want you to think it is.