Surely that is a contradiction in terms? 'Welcome' implies being glad to see someone who you have positive feelings towards, yet if you had positive feelings towards them you would be encouraging to turn around at the gates and not enter liverpool.
Jeez, these are scousers. They say welcome mate and before you know it they've already taken your wallet, watch and willy warmer. That sign is trying to sneek a quick dab into your rucksack.
Racist and reported