Do you think it's rude for a person to ask for a tip?

Situation: I have a membership to a spa, which is $150/month. So after I got my lashes and brows done, the husband who owns the place as I was on my way out asked ," Did you want to leave a tip?" I personally felt it was rude. Like dude, if you don't see me offering, don't ask. I literally have 150/month membership, yet you're still asking for a tip wtf.
Do you think it's rude for a person to ask for a tip?
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