You state one side and conveniently ignore the other side. THAT is in fact implying your way is better.Never suggested DIY was better, you're the one making that statement. Just stating a fact that someone going to a hairdresser/barber may not always end up happy with the result.
Yes, a hairdresser may give you a bad cut but why don't you balance your 'statement of fact' by adding that it is however less likely than a DIYer giving themselves a bad cut. Or would you like to try and argue that a DIY haircut is LESS likely to result in a bad cut?