Agreeing with what previous posters have said about being able to spot a TIF fairly easily. I think women are good at spotting patterns of behaviour and with TIFs, it's that instinct that the pattern is 'off'. Sometimes its blatantly obvious (wearing completely inappropriate clothing) or more subtle like how the person behaves (sitting with legs wide on public transport).
For instance I went to a children's party at an indoor activity centre recently and one of the fathers has decided to transition. Now this person isn't someone I see very often, so much that I couldn't remember his name ( so no chance of deadnaming!) but when I first saw the 'new' him out of the corner of my eye standing by a group of children, my first instinct was to ask the children to move away from him as I didn't recognise this person and they were standing too close to someone I didn't recognise. Then I looked closer and I recognised the father but I still felt a bit uneasy. It was a bit like the Emperor's new clothes where no one wants to say anything. He is quite a big burly bloke and the only effort he appears to have done to become a 'woman' is shave off his beard, have a manicure (to be fair, he did have lovely nails!), and stick on a rather crotty looking beanie hat. The effect made him look like Bennie from Crossroads with a nice set of acrylics.
He also now goes by a name that's the same as one of the other mums which confused me when people were referring to this name and wasn't sure who.thet were talking about!
I don't know the family very well but I think most, if not all of them are neurodivergent in some form. I know one of the children is autistic and very literal in his thinking so I don't know how he is coping with his dad being his 'mum'. Possibly not all that well as he didn't come to the party despite being invited.