Glitches don't mean you can't 'fight like a man,' if god gives you lemons, make lemonade. If there are new ways to beat others in this game then in my opinion everyone has their right to use them. It's just another tactic like any other. Most of what we do in vc:mp is a glitch. Jumping to break the shot animation is a glitch.
The whole ettiquette of 'not using glitches because they're unfair' is bollocks, everyone uses glitches, just some people use more and better ones than others. For anyone who doesn't like it then learn what they're doing and do it better.
Of course it's every player's choice whether or not they want to learn it or use it, but if they choose not to then imo they have no right to look down on those who do.
So Thijn, of course there's nothing wrong with not knowing how to do it or not using it, but equally there is nothing wrong with knowing and using it.
Besides that, sliding, like any move in vc:mp, can be countered by another move. It has its disadvantaged and advantages.