One of the biggest misconceptions I hear is that counter picks dont matter in low elos.
While true that player skill levels are not as high as other ranks when in bronze and silver, counter picks do not apply to that. Counter picking means that fundamentally, the kit of your selected champion performs well or doesn't perform well with the other champion. More or less, does the 5 abilities (pqwer) and stats that you have grant you an advantage over the opponents. This has 0% to do with the individual player's skill level. Now, playing a counter pick that you have no experience playing with or as is stupid. Comfort picks are first priority, but if you can get one that is also a counter. Do so.