Hi I find this strange behaviour, but looking at posts don't think I'm the first to experience this.
I'm in my 40s and no amount of cutting calories and exercise would shift the weight I'd gained.
Discovered the Keto diet and haven't looked back, lost 2 stone. I'm quite short at 5'3" so it is quite clear I've lost weight (I think) gone from about 11 stone to 9 stone.
My partner, who is wasn't particularly overweight for his height (about 5'8") started doing the diet as he was impressed at my results and he's now lost about 2 stone too.
Thing is EVERYONE we see comments on his weight loss and totally ignores mine!
Only one person, a work colleague, has said anything. I'm not desperate or needy for compliments...but just get puzzled that they mention my partner's & not mine, usually when we are both together.
Also I'm not sure they're being polite, because the same people were making comments like "aren't you interested in exercise?" (I was exercising!!) when I was overweight and other some other rude, barely disguised fattist (IMO) comments!
Surely if they were so bothered by my weight before, they should be praising me for my weight loss? 
Even when we are together and someone has said to my partner "oh look at you, looking slim!"...I will then comment "yes we've both being doing this diet..." they still say nothing 