why Jesus teachings could not be socialist

If you believe in group salvation, as a prominent speaker has many times emphasized in commencement speeches to students graduating, then yes, Jesus, for you, is a socialist. Speaking of people as if they were groups is not supported in interpretations of the Christian experience. The parable of the talents should take precedence here. We are all dealt a deck of talents and we should multiple it or it will be taken from us. Thereupon we are treated to a concise description of the free capitalist experience. Very difficult to escape from this, but even more difficult to assume the group mantle rather than individual responsibility taking the lead is Matt 20:15 where private property is assumed . There are others where only grace can justify you rather than any groups. In any case we all believe what suits our preconceived perspectives and desires from the root within ourselves. And that too is the spirit of the matter.