it wasn't that bad, it's just a special way he wanted to celebrate the win with, but let's be honest, it was cringy and i cringe everytime i see it, if someone silly did it like Monfils it would have been okay, but when Medvedev did it, his charisma went from 100 to 0 
Everybody can celebrate in his own way. It was the first grandslam that Medvedev won and he thought to be funny with his "special" celebration. I didn't also really like it, but don't really care.
It was certainly a big deal when Andy Murray won his first slam (also US Open), and then an even bigger deal when he won Wimbledon the following year. There will be a huge amount of expectation on Raducanu next Wimbledon, but given how she coped with the pressures of the US Open I think she'll be fine. But I think not just the fact of her US Open win, but also - and mainly - the nature of it, will already be a huge catalyst for the women's game here.
Yeah, when Andy Murray won Wimbledon, that was a special moment! We need to wait and see what happens; the last couple of grandslams always gave us different winners on the Women side and this US Open was only the 2nd grandslam that Ranucanu has played.