People to appear to be using infinite Cloak and firing while in stealth?

I've played in some servers for long periods of time and then some person will join and i'll kill them and then proceed to say i'm using some sort of hack or something. Usually I just think it's someone trying to troll me just because i'm a Rank 48 and actually decent. However I played in a match on a server this morning where one guy appeared to be firing the whole entire round while in stealth mode.

I proceeded to then do the usual "Tries to votekick" "No one votes"
he claims "lag?? I'm coming out of cloak to fire"

Next match comes up, and he's on my team and I see em a couple times and he does come out of cloak to fire.
However there is another person on the opposite team who is running around stealthed and firing this time who wasn't the last round.


Has anyone else seen anything like this?

Or am I just being trolled by a bunch of cheaters eh?

I've seen a cloak-firer on one server recently, however that time it was quite obvious it wasn't just lag as I saw him fire while cloaked many times during the matches.

And as for votekicking, sigh, it's just not working out is it?

Youre being trolled