nice to hear your perspective, I was born in London and I always find it the opposite! i think it very much depends upon which enclave you live in. I can also imagine that Londoners are in love with your accent. Brits and Americans have this mutual adoration thing I find. I lived in Maida Vale for a while and found that more friendly than others parts, but I still cant say I find Londoners particularly friendly. I now live in Bangkok, where everyone is more chatty. I think that the pandemic will change things in London drastically, similar to the effect that 9/11 had on New York. It will be interesting to see.