No, like the BJP (a very similar party in some respects) it contains multitudes. Whether non racist factions share responsibility for their brethren is another matter.
However:
There is racism embedded in more fundamentalist strict far-right sects of the party, that's easy to agree on. I believe it is still transitioning away from many southern-style Republicans and the recent generation putting the final shovels of dirt on the segregationist roots.
But absolutely no, it as a party is not racist: it's more realistic and less afraid of the hard-racial truths the country faces, while meanwhile it's opponents, Democrats, act as if they do not exist or live in a fairytail world. Sometimes it's not easy to ask the hard questions that may raise eyebrows or upset feelings. Simple as that.
> 'moderate' Republican who looks down on extreme base
> starts rambling about "racial truths"