We would more commonly use: It's cringy to see people overreact. Or It's quite cringe worthy to see people overreacting. I hope that helped 😇

I think you meant to say "overreact." "Overreaction" is the noun. So, you can say something like, "it's cringe to see people overreact."

In standard English, "cringe" is a verb: "It makes me cringe." Or it can be a noun: "My smile turned into a cringe." "Cringey" is an informal English adjective meaning "cringeworthy". Current slang among young people has "cringe" being used as an adjective as in your example, correctly written as: "It's cringe seeing people's overreaction." So, it's fine to use "cringe" as an adjective as long as you understand that it's slang, not something to be used in formal contexts.

It’s cringy to see people overreacting.

Hi there, we are a group of students and we have a 'English Club' every Saturday to practice spoken english. The club happens on Discord and it will be a pleasure have you together us. if you are interested to join us get the invite below! ;) https://discord.gg/uv6ssSU3