I do sympathise, but the fact is that your Skywards status or travel class is not the issue here. You are asking the lounge supervisors to break the rule relating to age & alcohol : "Due to local licensing laws, lounge access may not be available to unaccompanied minors and young passengers"
I'm not saying the rules are right or wrong ; but they are what they are, and they have been clearly stated.
Given what Emirates202 relates re his/her friend's son, it seems that your appearance might unfortunately go against you....? And for the lounge staff to say "I have to ask you to kindly leave the lounge" I wonder were you perhaps a little over-insistent in demanding access when the staff are acting within their rights to deny it ....?