If they aren't calling him for penalties, and so far they are not, then there is nothing wrong with what he's doing.
Would you rather he not hold and a pass get completed, or hold, the pass is incomplete, and no penalty is called? Because it sounds like you'd pick the first one.
And that's completely and utterly moronic.
This is another one of those things where what you think doesn't matter, not ever one little bit, and only what has actually happened on the field matters. And actually, on the field, Porter has not been called for some ridiculous number of penalties and actually, on the field, the guys who Porter has covered have not caught many passes and gained many yards.
And for some reason, that kills you. So you make up stupid crap to try to pretend that what has actually happened isn't what has really happened, that everyone in the whole world has been completely fooled.
Except for you, of course. Because you know better.