It's all a massive generalisation really, but I'd say I usually find Spain friendly and helpful (have been to lots of different places north, south and Madrid in the middle). Only been to Portugal once, but found the same. Rome and Venice both rather hostile, which is a pity as obviously they're both amazing places but I've been rather put off going back to them or elsewhere in Italy as a result.
I've found Parisians at worst to be professionally civil and at best to be delightfully helpful and friendly. Southern France, said a polite bonjour to someone in a village and she muttered something about us not being from around there. 
Morocco: Essaouira was laid-back, friendly and welcoming, but I really didn't like Marrakesh (been twice). Got seriously pressured by a group of teens to give them money for giving us directions, and it's the only time I've been anywhere and genuinely thought this could get nasty.
Costa Rica, I found people largely friendly, relaxed and jokey.
Slovenia I found very friendly, Ljubljana in particular (surprised to read that somebody found it hostile). Croatia not so much; there was still something a bit Soviet and surly about a lot of people I've come across, although TBF I've only been to quite heavily touristed places and this might just be people who work in the service industry and are heartily sick of foreigners. I did find Pula to be friendly by comparison.
Sweden and Norway I generally found people quite reserved, probably quite like the British really! Not impolite or unhelpful at all though. Denmark similar, maybe a little warmer.
I probably found the Baltic countries the most variable; went to them on one holiday and encountered everything from Soviet-era frostiness to super sweet, friendly and relaxed.
India, I found pretty friendly and helpful. Japan, very polite and helpful and cheerful. One man, we asked him directions and he actually led us to where we wanted to go. Only realised that he'd come way out of his way when we all nodded and bowed goodbye and he set off back in the opposite direction!