A question about some duo bot premades in blind pick.

We all know that lovely system of calling lanes in blind pick. As a supp main I usually call supp first. Though I noticed a trend where duo bot laners tend to start begging for the lane and often threaten to troll if you don't comply. This isn't the end of the world and I don't mind it that much, but I was wondering if other people who wanted to play adc or supp in blind pick usually just give the roles to the premades, even if you called first? Maybe I missed some unwritten consensus about the matter where duo laners always get priority over the lane? Or is it just considered good sportsmanship to give the lane away? I obviously have my own opinion on this, but as a supp main I might be a bit biased and would like to hear your opinion.
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