Jealous guys need to wind their neck in and stop assuming that everyone is just like them.
Just as some guys have a 10 inch cock, some guys have the capacity to produce a hell of a lot more cum than you do. Just because you and everyone you know squirts a teaspoon of cum doesn't mean that anyone who shoots a pint is somehow "faking it".
There is a direct correlation between your general health and diet, and the amount and quality of semen you produce, that's for starters.
Most men these days have an atrocious diet, packed with chemicals, sugar and salt, and they don't consume anywhere near enough nutrients, vitamins and minerals to be able to function at their peak. Change your diet, and you will likely see an increase. It won't be anything like this guy (probably) but surely you yourself have noticed that the amount you cum changes from day to day? This is because of sexual desire, pleasure, diet, hydration and the general health of your body.
Hydration is also an extremely important factor. With the increase in caffeine consumption in both coffee and energy drinks, many men are again lowering their hydration levels to a dangerous degree.
From personal experience I know for a fact that there are many millions of men who can cum a hell of a lot more than the average male. Having been in the bodybuilding and fitness world for several years I know for a fact that diet and overall health do impact cum production. Some men have a much larger capacity anyway, but most men are not healthy enough to be able to maximize their production.
I have seen men who participate in sporting activities (and have the diet for that) shoot cum over their own shoulders, cover their stomachs in splooge, give a girl a massive facial, all kinds of things.
I know a guy in London who cums for more than fifteen seconds at a time, shooting off enough to drench a towel.
Once again, just because YOU don't cum like that doesn't mean every other man on the planet must conform to suit your own physical traits.