I'm going to try to set boundaries with my toxic sister in law who has stirred up so much drama that resulted in not being invited to my wedding
What kind of drama has she stirred up warranted not being invited to your wedding?
She's stupid and always yells at me.
Family members expect to be invited to special events, but its okay to exclude one if they're being toxic. She may be angry that you're setting boundaries but thats your right since it's your wedding.
I should stand up for myself and stop getting bullied by people.
You're doing the right thing by keeping distance from your toxic sister-in-law. It's nice to see you standing up for yourself.