Does being on a GLP-1 medication change how people approach social situations involving food?

For a lot of people, yes. Eating smaller portions in social settings, needing to be more selective about what and when they eat due to reduced capacity, or fielding questions/comments from others about eating less are commonly reported adjustments. Some people find it easier over time as they get used to navigating it, others still find certain situations (big meals, multiple courses) genuinely challenging. References: https://obesitycanada.ca/healthcare-professionals/adult-clinical-practice-guideline/

Dinners out took some getting used to, ordering less and getting comments about it from people who didn't know. Got easier once I had a go-to explanation ready.