[Loose Screw x 2]

Should it be a psychiatrist's place to tell you who you should or shouldn't have a relationship of any kind with?
Now, I know that doctors give advice but, what about a doctor who asks about what you do during the day or about your online activities and who you're talking to online and how much you know about them and making suggestions about who you associate with?
Is this normal or should I be irritated by this as an invasion of my privacy? Your thoughts please?

I say this is normal. The responses to such questions give an overall indication of how healthy you are. It is his job to delve into your personal habits and be nosey.

[Stronger]

These are honestly the kinds of conversations I have with my therapist frequently. I take her words as advice, not commands most of the time.
And my current therapist is the only one who has really ever had that kind of therapy style (I've had 9 outpatient therapists).

That being said, I don't think I've ever had that kind of conversation with my pdoc.
If you respect your pdoc, and feel like you are in a good place to be able to make a call about where his/her judgement is coming from, then maybe you should talk to him/her about how it makes you feel when those comments come up. Because that really is more in the therapy domain, and you may not see your pdoc often enough for those conversations to really be effective.

[Miswimmy1]

I agree with Stronger above and say that if you feel uncomfortable, ask your pdoc about it. I know that for me, my therapist and pdoc have often inquired as to my internet activities, just because working on developing and maintaining relationships in real life is something that I've been focusing on in therapy. Perhaps your pdoc is asking from a therapeutic standpoint.