Everyone keeps by their own level of kashrus. Some people eat only glatt, some eat only beit yosef; some eat/drink only cholov yisroal, while other people don't particularly care. The only two times it is relevant to care if someone is super strict is if the person is keeping unnecessary strictness while simultaneously living on charity (money can be better spent than supporting a zealots cholov yisroal habit) and the second is if a catering-like facility is not upholding by strict kashrus standards.
2 examples of the latter:
1- A catering facility is strictly certified kosher. The hall it is located in has a ton of hustle throughout the week. Then one day of the week, say every Friday, an organization that is local allows outside food to come in from people's homes. The kashering agency turns a blind-eye to it without fully examing where all of the food comes from. Would you eat there?
2- Imagine a scenario in which a catering facility is having a fleishig's meal. The kitchen is fleishigs. If ever there is a need for dairy, the entire kitchen gets covered by tablecloth. If anything needs to be put into the oven, it gets double wrapped to avoid treifing the oven. In the scenario you are imagining picture the facility is having fleishigs for that day. One of the mini-organizations that comes to that hall decides they don't want fleishigs but want milchigs, so they cover one area with the tablecloth- only a few inches away- from the uncovered area/fleishigs location, basically meaning, anything could happen. Would you eat there?
Now, if i told you both 1 and 2 were the same place, would you eat there?