The first crisis being the pandemic showed how great this country is compared to the rest of Europe.
This statement shows so many things about the mindset of many who supported brexit.
First, the uk is still in europe.
Brexit supporters see events (eg the vaccination program) through a biased lens and ignore incovenient facts. In this case, ignoring the disproportionate number of deaths and subsquent delta fuck up. Ignoring other countries (outside the EU) that have vaccinated more. Treating the eu as one large country. Ignoring naunced facts for a gloating narrative (eg AZ manufacturing issues). Showing misplaced nationalism (boasting about vaccination - life or death - is pretty bad taste).
That is the problem. Brexit will be a slow puncture, resulting in a lot of shitness for the majority. Supporters of brexit either don't follow the news closely enough, get it from biased sources and/or distort it to fit their preconceived ideas. They'll just ignore or minimise any brexit-related outcomes (and there are and will be lots to come).
It reminds me of the effects of financial crisis. Other countries recovered fairly quickly. Britain was still living with austerity 10 years after. I lived in two other countries during this time and got significant salary increases, which would not have happened if I'd have stayed in the uk.
Wage stagnation as a result of austerity is still going on and expected to last for another decade in the uk because of covid/brexit.
The uk public has been conned by the government and the media are complicit. (By the way i find it bonkers the way people blame the opposition rather than the government or the propaganda that passes for 80% of the press.)