I responded to the other comment, but I work at Discourse. As a site admin you can disable badges (which is our gamification system) entirely, or you can get rid of individual badges.

If you're interested in trying Discourse, our lowest hosting plan is $20/month, or if you want to self-host there have been a bunch of improvements in the setup process recently, see https://meta.discourse.org/t/self-hosting-discourse-just-got...