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The beauty industry doesn't pay it's staff very well, hairdressers for example really rely on their tips. The business may be making lots of money but the staff generally don't.
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Tipping only encourages employers to continue paying measly wages, just like the restaurant trade did, for generations.
Why single out the customer as being "mean" for not tipping, when it is, really, the employer who is being mean with the wages?
Talk about blame-shifting!
By the way, if you are a self-styled socialist, you should be picketing these places. If you cross the threshold of a stingy employer, you are colluding with the very ideology you profess to oppose.
(Where's Mikey, btw). :)