Why are Veteran Players gatekeeping this game from newcomers?

I’m new to Insurgency, started playing last week. Noticed that many of the veterans just big dick everybody. Biggest example was today when I was griefed then kicked.

I’m only a level 11 and only play pve, and I was firing into a hallway when this level 144 ran through my crosshairs and I shot him once and immediately quit shooting. For the next 2 minutes he keeps shooting me and hitting me. He won’t stop so I kill him. He comes back the next round and does the same thing until he gets eventually kills me. Then votes to kick me and I’m kicked.

I was like an hour into the match and gained none of my experience points. I’m new to tactical shooters overall so I only average 25-40 kills a match. The game leaves game pass and the as thinking about buying it but this seems to be a reoccurring issue.

I don’t understand why veteran players in a niche game drive new players away to create some frat culture within the community.

Edit: I came to the conclusion that it’s less of gatekeeping issue and just more of a griefing issue. And that it’s also not as common, just got unlucky. Thank you guys for the feedback.