You are defending ableist usage of a term that is important in psychology. The usage you’re suggesting is “normal” is much more recent, and is predominantly employed by people who have little or no consideration for others, and may even derive amusement out of deliberately antagonizing others.No, it's a normal turn a of phrase and nothing is meant by it. It's used when something is said that can potentially rile you up or push "those" buttons that can cause someone to react angrily or with varying degrees of annoyance.
We have users on this forum with PTSD. Calling the reaction of people who are simply upset about a difference of opinion “triggered” is extremely disrespectful towards those users, and trivializes the impact actual triggers can have on people suffering from mental health issues (or certain physical conditions - epileptics can have seizure triggers for example).