Do you tip your nail tech if they didn’t do a good job?

My friend and I went to get pedicures for her birthday, I asked for a French pedi and she didn’t do a good job, the tips were uneven and I had to ask her to fix them twice and I still wasn’t satisfied( they were terrible my friends agreed). My friend said she doesn’t tip when they don’t do a good job. The pedicure was $35 and I tipped anyways but now I regret tipping her because well she sucked. What do you do in this situation?

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