If it bothers others, those who are choosing to spend time with you - in person -then you’re being discourteous to your guests. Or you are a discourteous guest.
You can of course choose not to associate with those who share this view of good manners.
I’m not talking about guests in my home I’m talking about situations such as I’m eating alone at a restaurant counter and strangers next to me object. Or I’m at a ball game and strangers object. I’ve been in both situations and it’s amazing that they converse with companions, at the same voice volume level but object to the use of a phone.