Actors are also real people, and their emotional expression can be taken seriously, but their characters aren't 'real'. Or take a standup comedian, they may be speaking as 'themself' but it is still a comic persona that you see on stage, the character of which is distorted by the medium, and you have to treat it as such. The medium of posting here - partially through the style differences between posting and actually talking, but mostly imo due to anonymity and the screen barrier - creates such a distortion, and the alienation is a result of that distorition, of failing to understand that it is a distorition.

The thing is, although alienation is a downside, this distortion also has upsides, like for example it allows people to be funnier, more raw, etc.