I disagree with property from an ideological standpoint and I disregard property rights whenever convenient. Intellectual property is really convenient. I have no problem with being called a thief for fallacial reasons because I'm fine with being called a thief for legitimate reasons: I steal real, physical objects, sometimes for money. It's a fantastic rebuttal. Yes, I steal. You cannot stop me.

If I think an artist should have my personal financial support, I will go to a show, buy a ticket, buy a shirt or patch or even media at their merch table, and maybe toss some cash in the tips jar. They'll get 100% of my money, sans label or PayPal fees, and I get a more memorable experience than a pile of FLACs. Last time I was at a show, I dropped $30 on shitty t-shirts, and my friends (that I introduced to the band via my pirate ways) dropped more. Good tradeoff, no matter how you count it, and it didn't require the exercise of intellectual property.

Don't argue the semantics of the word "stealing". Attack and offend the idea of property (whatever form) directly. According to IP, copying is stealing. Embrace and acknowledge it. If you want to argue about why IP isn't a social construct worthy of maintenance, do so. But don't try to nullify its points while leaving the rest of it standing, because the rest of it is very clear on the fact that point exists.