Is criticism of Jordan Henderson's summer move to Saudi Arabia valid?

The former Liverpool midfielder was booed off the field during his substitution, in England's 1-0 friendly win over Australia on Friday evening. He has received public backlash and media scrutiny since his £12m transfer to Al Ettifaq in the Saudi Arabian Pro League, but England manager Gareth Southgate has remained faithful to Henderson, condemning the booing as "defying logic". Is this the right action from Gareth Southgate or should the 53 year old be more considerate of the political implications of Henderson's surprise move to the Middle East?