WP_Query with 2 genres

Question

Something along these lines should work:

$myposts = new WP_Query( array(
    'post_type' => 'widgets', 
    'post__not_in' => array($wp_query->post->ID),
    'tax_query' => array(
        array(
            'taxonomy' => 'genre',
            'field' => 'slug',
            'terms' => array( 'styleA', 'styleB' )
        )
    )
) );

I’m not sure if you need to add 'relation' => 'OR', after line 4, so try it with/without that (i.e. before the 'tax_query'... line).