No it won't cause any negative effects
It'll block servers you denied once the connection to that server has been severed so wait a few minutes in the lobby after the game then re-search otherwise you run the risk of connecting to it again. Also there are many servers clustered in a singular location, you'll be denying a single server in that cluster, not the location.
What do you see when trying to access?
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Tac toby got a reaction from Rodolfo Lima in Horrible gameplay/ hits not registering