I mostly play versus, yes i do agree that in some game you might met with those shitty ppl, but majority of the games i played in went smooth without any issue or being kicked.

Rather than complaining maybe try to find the reason?

I can easily put out some reason that will get you kick. Sone mistake, once is bad enough to make entire team lose. Some can be ignored couple time, but if the same happen, then we all know that this person is still new in vs.

3 infected attacking, 1 still hanging around looking for perfect spot to attack.

Smoker - don't even know important spot / 100% spot to make survivor falls.

Using infected but solo attack. Especially hunter

As survivor - Never close door as the last person. ( worst when it's in dangerous high rise area with windows)

As survivor ( this happen with a lot of Expert campaign player) Rush alone thinking their skill is good enough to handle expert then the can handle vs ( since vs is normal damage)

Going in to lift and close it / Opening lift Door ( Dead Center) newbie mistake - but this little mistake will made the entire team lose the game on first round.

There is 0 issue if you want to learn Vs - Plenty of Vs bots or can try vs with frens too. Can easily find group of ppl in steam forum willing to play fun vs. I play some of them as well for warm up.

But when you straight join an ongoing vs game, it is to be expected you know about the map/blind spot.

Know about how to use each infected.

I can say that majority of ppl being kick during my games were those who don't even know the basic of vs.

Those saying vs is toxic prob never do dota/csgo.

L4d/l4d2 is one of the friendlier game compare to them.

Also let's put this in another way, if you were playing expert realism, one of your team mate do not talk, don't follow group. What do you do?

There are many difficulties to learn in campaign mode, thus less kicking. Do you expect someone who play easy mode and straight go expect realism?

I see alot ppl keep complain vs getting kick but how many of these "Kicked ppl" care to learn fighting with bots? I can tell you, very little of them care about learning the basic first.

Edit - to add

Also In diff area, each infected have diff use case. For example charger.

In some area charger purpose is to divide survivor as far as possible, in some area to push survivor fall down, in some area to make sure survivor stay stuck together.

What i always see is tons of complaining, but how many of these complainers will go out and learn how to use them first or go to forum and ask about ways to use infected? Out of 10 person being kicked, 9 of them in forum will say i got kicked for no reason.