Observations and et cetera’s

unprofessional: adjective 
below or contrary to the standards expected in a particular profession or activity.

A word only relevant when a person is actually engaged or employed, in a profession, or particular activity.
To expect someone to be ‘professional’ before they have embarked upon an activity or employment is, therefore, totally ludicrous and indicative of the user being unprofessional.

polite: adjective
having or showing behaviour that is respectful and considerate of other people.

Before calling out another person for their behaviour be very sure that you have acted respectfully and politely in the first instance.

friend: noun
a person with whom one has a bond of mutual affection, typically one exclusive of sexual or family relations.

The term Friends within Second Life is somewhat loosely used. It’s become Debased even.
We have our Friends – people we actually care about.
And then there are people who are not a Friend as such. They’re on our friends list because they – or we – have, for various reasons, felt the need to be in easier contact.
Usually in Second Life it’s because of a perceived convenience to one or both of the parties concerned.
Accepting the offer of Friendship was a courtesy given to the Asker – but it does not give them the right to expect to know when, or if, we are online.
Switching someone’s ability to see us online is a basic form of ensuring our privacy. We don’t hang a sign outside our front door in the real world to tell the world we are at home or away.
Neither should we be expected to do so in our online life.