I think there's some truth in this, but many people have always been unwilling to interact, or at least highly selective about their interactions. There's indeed a bit of a stereotype about the British being polite but reserved and socially awkward, while those in some other countries are more sociable but more aggressive. As with most stereotypes, it's of course, well, a stereotype! But I do think that there are a certain number of people who only feel able to be sociable if they've had something to drink, which leads to a certain amount of excessive drinking,
There's at least one way in which modern technology can make people less unsociable. In the past, people were often very resentful of other people disturbing them when they were watching TV: reasonable and manageable if they just had a few favourite programmes; more difficult if they spent most of their free time watching TV. Nowadays, with the possibility of catching up on iPlayer, people tend to be a bit more relaxed on this subject.
And there's always been some form of technology or activity, which was being blamed for people's social difficulties, or seen as a bad influence. For my generation, it was indeed TV. A generation or two earlier, comics and the cinema. Go back far enough, and I've been told that Aristotle was complaining that this new invention known as literacy was interfering with oral communication and with memorization.
I think that the biggest problems with screen use are that it reduces physical activity, and that it reduces time spent in reading books. And that social media can be misused for purposes such as cyberbullying, grooming, and spreading disinformation. But I'm not sure that it really makes us less socially competent than we were in the past.