I do not remember when Bangladesh lost so badly in their own venue. The Bangladesh team won the series against the India team. On the other hand, the last few series of England did not have good performances.
England had also won the ODI series against Bangladesh in 2016. It was a home series for Bangladesh. Now they have lost against England again in their home ground. Probably Bangladesh will be whitewashed in this series. The third match will be played in a different venue, the condition of the pitch is batting friendly there.
England is always a big threat to Bangladesh so this had to happen. England has only visited teams that have beaten Bangladesh twice in bilateral men's ODI series, over the last eight years. This English squad has taken the game to a new level in modern times. Also strong contender for the upcoming ODI world cup. It wouldn't surprise me if they won the ODI world cup as well. Anyway, let's hope that Chattogram pitch conditions help Bangladesh.