c-ptsdofficial:

What Being Triggered Is: having extremely distressing emotions activated by a catalyst (often referred to as a ‘trigger’)

What Being Triggered Is Not: overreacting, being sensitive, having different opinions than you, correcting you on your offensive jokes

What A Trigger Is: a stimulus that causes extreme reactions in mentally ill people, often to the extent of panic attacks

What A Trigger Is Not: something that makes someone kinda offended or annoyed