It was a question, not a speculation - and could have been met with a denial, asking the same question in reply or laughing it off - none of which would be “making it personal.”
Fine. Please note, however, that the complaint was lodged over my comments about 1940s Lutherans, which he/she evidently took quite personally. The “getting personal” tripwire can be very idiosyncratic in these dialogues, and I want to make sure we’re dealing with objective rules.