No one should be discouraging anything, it's not a rule so there is nothing to say.
It's down to your personal view on sportsmanship. Some would say blocking is bad sportsmanship, again that view is determined at that time by which team is being blocked.
At this stage it is part of the game and quite frankly it happens on so few maps that it doesn't even deserve this level of fuss.
Until it is written in stone, players can block and should not be berated for it. If they are on your team then defrost them if you don't agree on the tactic.
Not everyone will agree with this but it's how it is.
We have very few rules and not blocking isn't one of them.
In any case Sammy is looking to see if he can move the Spawn point outside which should sort it out.