People starring you at the gym?

So here I was doing calf raise, and one man in his 30s walks around me. Keeps starring at me. I don't know what hell was he trying to do. I was annoyed and got really angry, because of which I fucked up my reps.
What do you do in this situation?
And yeah there are hardly people who work for calves. I don't see people working for legs.
People starring you at the gym?
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