Dealing with pervs on nude beaches?

I (32f) have been going to nudist beaches for about 5 years now. Luckily in all that time I’ve only had two “bad” experiences with men masturbating near me or like in my general direction. Both times I was with the same female friend. The first time we decided to ignore but he just kept getting closer and eventually we packed our stuff and moved closer to where there were other people. I hated that feeling as I felt it gave him the power.

The second time we were like well ignoring didn’t work, let’s try shaming. So we started yelling “pajero!” (Like pervert in Spanish as we were in LatinAmerica) but I think he had a humiliation kink or something because he seemed to like it.

So now I feel like I’m out of ideas. Was really disheartening. Thoughts?