remainers are likely to be young people
That is not necessarily true. The average young voter is less likely to vote. It is also true that any voter is more likely to be older.
Therefore Remain voters could be any age. Although it could be argued that young people are more likely to vote Remain, it doesn't follow that they actually did so.
Just because one causal relationship is true, does not mean that the reverse is automatically true. The sun warms the earth, but the earth does not warm the sun or reduce the sun's heat, etc.
It also true that young people are more likely to be more highly educated. Their educational achievements are immaterial, unless you consider non-vocational degree holders to be less highly educated than vocational degree holders. Which does not make much sense. All degree qualifications are judged to be equal in terms of educational achievement.
You can, of course, apply a judgmental opinion of them, as in having an excessively critical opinion of them. Which you appear to have done so.
TV viewing preferences and life experiences can give rise to biased or overly-influenced decisions. That applies to older and younger voters.
I would assume that Love Island, does not influence viewers politically, does it?
Life experiences can give rise to negative as well as positive experiences.
As to your comment about Remainers and racism, it is a recognised fact that anti-immigration was a major factor in the decision of Leave voters. Leave politicians made much political capital in influencing those voters, even to the point of presenting unsupportable and dishonest propaganda.
So it is not surprising in the least if there has been much debate about it, and much dissatisfaction from Remain voters.
