Averaging 3 centuries to produce one number and comparing that to two decades of above-normal surface temperature measurements (with a well known 0.1 to 0.15 degree bias)?
Comparing a reference year in one study to reference years in others which use different measurements and calculate global average differently? Nice bit of 1900ism there.
There were certainly decades in the MWP that exceeded the extremes of the 1980's and 1990's, that's easy to establish from the long term averages being higher and what we observe about short term variations. You have yet to show a single study showing the MWP was cooler than the 1900's which would call that into question. On the other hand, I and the others have presented global temperatures proxies to show that the MWP was not isolated to the north Atlantic. Yet all you do is blame eurocentrism for the overemphasis on MWP and wave around your non-quantifiable (in terms of temperature offsets) ocean current local effects as the other cause.
On the other hand I admit it is easy to get caught up in Viking stories. But I will keep waiting for your evidence that MWP was cooler than the 1900's comparing averages to averages.