There could be many reason why she wore it
From a harmless yes harmless fan of both clubs
To
A tribute to each away fixture she attends in the prem - she may have dozens of these shirts
To
A memorium to a dead friend loved one who supports one of the clubs
We don't know why so just cut her some slack jeez
It is not harmless its shameful and she deserves all the ridicule heaped upon her, jeez.
. At least make some effort ffs.