Anxiety attack at work, caused by colleague, how to handle?

Clash Royale CLAN TAG #URR8PPP .everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty margin-bottom:0; up vote 0 down vote favorite I have a colleague who thinks he knows everything better than me. Sure, he knows many things, but not everything. He pulls up my changes and starts criticizing them. I'm sure our manager put him up to that. I constantly have to defend my code, even when I know it’s good code and his only argument is “I know because I programmed for 20 years and you just 1â€Â. He says “Why are you using Linq to filter that list, a couple foreach work too.â€Â. I think he’s trying to hide that he’s the only developer in the company that doesn’t understand Linq. He keeps te...