sx 6s are confrontational people. That's the counter-phobic type, and it's more likely an ISFP than any other IxFx type. The obsequious variety you may seek is likely the sp/so 6, who acts like a harmless, non-threatening puppy to get people on their side. Maybe some are sp/sx with weaker sx. The sp instinctual type is the phobic 6 who is less rigid than the so type. Odds of being ISFJ if an IxFx type is high. INFP 6s are not that common, IMO, and I think the mistyping is more often the MBTI type than the enneagram type.
Nah...I know a backhanded "compliment" when I see one
It's hard to praise an INFP, because you must find the "right" reason for praise or it will not be interpreted as a compliment. It's pretty bad how we devalue other's valuations of ourselves unless it meets our criteria for "meaningful"...
Both IxFP types will also note what is NOT said as much as what is said, and it's this reading in-between the lines that partly accounts for our infamous sensitivity. Example: You praise an IxFP. Nowhere do you mention, say, intellect. IxFP may think, "Oh, they like despite thinking I'm stupid; how patronizing is that!". Then you praise the IxFP and say nothing of appearance, then they may think, "So, what then? I'm a toad?!". Okay, it's not really that bad, and it mostly only applies when someone is giving a reason that is meant to encompass our entire person, so if it sounds too one-dimensional then it tends to feel dismissive almost.