I have not found evidence to support this hypothesis. Unless you are grossly and spectacularly insensitive, I do not see a plausible mechanism by which simply starting a conversation could have "lifelong negative effects".

There is reasonably strong evidence to suggest that social connectedness has a substantial protective effect on suicide risk. Just asking "Hey, how are you?" and making time to listen can make a meaningful difference to someone in distress.

https://www.cdc.gov/ViolencePrevention/pdf/Suicide_Strategic...