Yeah, lots of jerks on this site. And I guess people who have been on the site for 9 years and who don't have that many likes for such a long period of time..
If you are masturbating to the point of irritation then you might want to take a break or make sure you are using lube. Other than skin irritation, you really can't cause any damage from masturbating too much unless you are doing it in an unusual way that can cause harm.
You might be doing it in a way that can cause harm. Can you explain what you mean by "dry on your mattress?" If you are lying face down and humping your mattress then you should be careful because putting your full body weight on your penis can cause some damage. It's probably less risky if you put a pillow or something under you for some extra cushion, but its probably better if you just use a different method.
You might try getting a toy like a fleshlight if you want something other than your hand. I'm not a huge fan of them so I don't necessarily recommend them, but it's something different that doesn't have a risk of causing damage. You can also check out jackinworld.com, they recommend a variety of different ways to masturbate that might be more interesting and easier on your skin. Chance are, though, that you will get relief from the problem if you just use lube.
I would suggest putting that guy on ignore, from his posting history you won't be missing anything worth your time.